Making a Consistent Pattern

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sounds like you might be having some lag or packet loss issues. Sometimes texture changes won't take when that happens. Anyway, when trying to get a texture applied to prims of different size to be the same scale, the easiest way to do it is with "repeats per meter." That sets texture scale according to world units instead of object units. You'll just have to adjust the offsets so they line up with each other.

I set the repeats per meter on both walls to same value but the setting would not hold and the pattern reverted back to the original setting when I applied the texture.

Maybe the with the wall attached it is accepting the settings from the other pieces.

I only know enough about this to be dangerous.

Yes, that's an annoying bug. I get that all the time. What I do in those cases is, I change the repeats to match and as quickly as I can, I close the edit window. That makes the texture stay and doesn't snap back to the previous size.

Two possibilities. First, it could be the bug Calveen mentioned. If his suggestion doesn't work, try replacing the offending prims. Shift-drag them to leave copies behind, and then delete the originals. Often it's the prims themselves that get bugged, and then they just refuse to behave themselves forever after. The only recourse is to replace them.

Second, it might just be that you're selecting the whole linked object at once instead of just selecting one prim at a time. To select an individual prim within a linkset, make sure Edit Linked Parts is turned on in the editor before you click on the prim. To select an individual face of a prim, instead of the whole prim, turn on Select Texture and click on the face you want to select. If you don't have either of those options turned on, then whatever you do will affect the whole linkset at once.

Also, you might know this already, but with repeats per meter, you'll get better results if you use planar mapping instead of default mapping. RPM in default doesn't always work. You end up with the repeats being properly measured in one dimension, but no the other. It's annoying. Planar mapping doesn't have that problem.