I have just finished thinsetting glass mosaic tile for my kitchen backsplash. My tiling skills are a bit rusty and I discovered after the fact that a dozen or so of the 1" tiles are loose.

The tiles came on a mesh backing so they aren't going to fall off, but they are not sufficiently bedded in the thinset. So...can I let this slide and just go ahead and grout? Are there any other fixes that will work short of tearing it all out?

Thanks in advance for your advice!