When liquids (e.g. glue) or gases (e.g. oxygen) from Gregtech get into Refined Storage in any way, they simply disappear.
I tested some options and realized that they are not just not displayed, but completely disappear.
At the same time, these liquids, and gases work and are displayed if you use external storage.
There is no such problem when using Applied Energetics.

I am using the latest version of ATM9 (0.2.35).

I'm adding that I've had this issue with Refined Storage Liquid Storage beyond liquid xp and gregtech stuff -- blood from evilcraft, honey, oil, brine, liquid lithium, liquid sodium, etc. Using any of the Importers (reg to mega, doesn't matter) to import liquid into liquid storage ACTS like it's working but it vanishes and basically gets deleted. Even if you try and use an exporter to then export the liquid out, nothing appears.

Similar issue with External Storage not seeming to recognize all fluids in a dynamic tank (see examples above). It's extremely annoying to have to use multiple sets of quantum entangloporters just to move fluids across large distances.

And yeah, liquids and gases from other mods work fine

Since I have a problem also with Refined storage Fluid Storage, I will add this here.

I have moved some experience from Mekanism's Fluid Tanks to Refined storage Fluid storage, it appears there, however whenever you click on it, it subtracts 1000 mb, and gives you an empty bucket.
Also, if you try with an exporter on fluid mode, it wont allow you to drag and drop any experience liquid from JEI menu.

LE: Managed to give it as a filter to the exporter with another Mekanism Fluid Tank with Experience in it, however, it still doesnt export the experience.
Even LE: Sophisticated backpacks make this Experience liquid, while Mob Grinding Utils Hopper will give you "Fluid XP" which you can work more with it.