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​@Tom E. I’m having the exact same issue, but with sizing variables in Styles. I can select a font style, weight, size, etc. and select a variable. After closing the window and opening up the style again, it’s not connected to the item anymore.

Here, I’ve hovering over Paragraph spacing for a Heading 1. Figma knows what variable it’s linked to, as you can see in the tooltip.

However, if I click on the Variable 24, you can see it’s not really connected correctly:
 

No matter how many times I re-select the correct one, it defaults back to “nothing selected.”

Oddly enough, this problem seems to be jumping around. Yesterday, I had the same issue with font-weight. I would select “bold” from my list of variables and it wouldn’t stay selected. Today selecting a font-weight works correctly.

Do you mind sharing how you actually fixed this? I keep reconnecting and when I re-open a style, it’s not connected anymore.

​@Grant Szalay in our case, simply selecting the correct value from the variable collection resolved it.

What you described seems like a different issue, especially the jumping around part.

In your example, when you click on the variable and it opens the variable menu, it’s highlighting a completely different variable (“Primitives/spacing/xxxs”). Have you tried unlinking the variable and then relinking it to the correct variable?

What are the variable collections you are using, are they local or from team libraries?

​@Tom E. In this case, all the variable collections and styles are in the same file. The light gray background is actually just Figma highlighting the 1st item in the variables window. If any variable is selected, the selection doesn’t stick. I immediately reopen the variables dropdown and it’s as if nothing was ever selected.

I can select any other variable and it simply won’t stick. I’ve unlinked, reselected a new variable, and it still doesn’t stick.

Here’s a better screenshot. You can see the line height in the styles window is a variable, it’s 52, and Figma sees it as “Typography/heading/lineHeight/1” however, it’s NOT selected in the variable doropdown menu.
 

​@Grant Szalay I think that might be a Figma UI bug - it behaves the same way for me.

The font style does not show a selection in the variable collection for Line height variables:

But if I assign the style to an element and then detach the style, it does show up selected in the element’s line height property:
 

So even though the UI behaves unexpectedly, the variable itself is still connected (at least for me). 
If you have the text style assigned to an element, does the element’s line height not update when you change the line height setting in the text style?

The same issue happened to me 😥.I’ve tried the solution above and it didn’t work. 

This same issue has been plaguing me for months! The “fix” is extremely cryptic and tedious... Not good!!

Same issue for me and I can’t seem to make the [i] go away.