ABSOLUTELY! I have been told so many times to correct something that previously worked, I began to believe I was just terrible!
What happened to me was, I took English lessons in the mid 80's for about two years (hunter/jumper, etc)..then after the three year mark. I had to stop riding. Work, family, etc...
Forward now to the mid 90's...Started again, and I would often go back to a trusted trainer (others told me of..), and they would proceed to undo some of what I was sure was correct.Again.
Onto the 2000s now..a few go's at riding again, new horse, new trainer, new correction! (keep in mind that some of my bad habits DID need to be addressed but, others seemed nit-pickey at best)..I managed to stay with these trainers for a good while, and I did absorb various "variations-on-a-theme" methods of doing the same thing, and a good deal of this information became useful in certain new situations but, it was an annoying thing to go though, over and over..
Hold on, were not done..
NOW, I own a Tennessee Walking Horse, and I have to relearn one more time! Difference is this time, I am relying on all I have absorbed over the years, past experience with my own horses, and riding others horses,and even this forums experts to fix what goes askew...
Point is, if it seems the trainer has anything new (and useful) to offer, take it in stride, and maybe as I did, your experience level may only improve.
Good Luck, try to enjoy every moment you can in the saddle! -Lw