A queen, jack and ten can look like one tidy piece of a Spider Solitaire board. The ranks are in order, every card is face up, and another column has a place for the queen. Yet the group will not move. Before blaming the browser, look at the suits. Placing cards in order and moving those cards together are different permissions.
Use a browser game of two-suit Spider Solitaire as a reference while working through the example below. Its spades and hearts make the distinction visible. You do not need to reproduce the exact example on demand: it is a hypothetical position, not a custom board you can load. Look for the same kind of suit boundary in your own deal.
What is on the board
Two-suit Spider still uses 104 cards. There are four copies of each rank in spades and four in hearts, not a smaller deck made by throwing away two suits. Of those cards, 54 are dealt into ten columns. The first four columns receive six cards each, and the other six receive five. Only the exposed card at the bottom of each column begins face up. The remaining 50 cards stay in the stock.
The aim is to assemble eight complete same-suit sequences from king down to ace. A completed sequence is removed from the playing area. A partial sequence can move too, but only if it meets the movement rule; it does not have to contain all thirteen ranks first.
A legal landing does not make a movable group
An uncovered card can land on an uncovered card one rank higher in another column. Suit does not restrict that landing. A jack of hearts may therefore go below a queen of spades. The move is legal, even though the resulting pair cannot be picked up together.
To move a group, start with the card you intend to select and check every card below it through to the exposed end. All must be face up, descend by one rank at a time and share the same suit. If any part fails that test, you cannot move that whole group as a unit.
You may instead select a shorter valid group lower down the column. That is a separate choice by the player, not a promise that the interface will automatically shorten an invalid selection. An empty column is another possible destination for a valid card or group in the linked game.
Follow the queen, jack and ten
Imagine the exposed end of one column contains a queen of spades, a jack of hearts and a ten of hearts, in that order. All three cards are face up, with the ten at the bottom. The ranks descend correctly, but the suit changes between the queen and jack.
Selecting the queen does not let you carry all three cards together. Selecting the jack does let you move the jack and ten as a pair. Both are hearts, their ranks are consecutive, and nothing else lies below the ten.
That pair can land on an uncovered queen in another column. If the destination is a heart, the new queen-jack-ten group shares one suit. If the destination is a spade, the landing is still legal, but another mixed-suit boundary remains. In either case, the original queen of spades is now uncovered and could move onto an uncovered king, or into an empty column.
Read from the exposed end upwards
Start at the bottom card and read upwards, looking for the largest uninterrupted same-suit sequence. Stop when you reach a different suit, a missing rank or a face-down card. The valid sequence below that boundary is one possible group to select. The cards above it cannot come along simply because some of their ranks happen to fit.
Try that check on the browser board before choosing a destination. Identify the card at the top of your intended group, then check the whole group downwards once more. Finally, inspect the destination: its exposed card must be one rank higher than the selected card, unless you are using an empty column.
The game’s rules are available below the board. A refused move is a reason to compare your intended group with those rules, not evidence that the game is hiding them or choosing a different group for you.
Check again after dealing
Drawing from the stock adds a new face-up card to each column. Those cards can interrupt groups that were movable a moment earlier. A neat sequence higher up a column is no longer available as a unit if the new exposed card breaks its rank or suit pattern.
This is why reading the present position matters more than remembering how tidy the column looked before the deal. Check the new bottom card and work upwards again. You are not looking for a guaranteed winning move. You are first establishing which pieces the rules actually allow you to move, so that the next decision starts from the board you have rather than the board you thought you had.