To the OP. Welcome to the wonderful wacky world of WGT. There is really no rhyme or reason why shots that worked one day do not work another day. That is all part of the built in "charm"of this game.
Some players think they can formulate their play, and in some cases they can get real close, but in the long run there are still glitches that are unexplained as have been mentioned.
Just before I was ready to move from TM to Legend I was killing the courses and I really thought I was on my way to being good. After making Legend it's been ridiculous. Missing four foot putts by inches, driving dings that find the rough, bunker shots that never leave the bunker.
The fun never stops......... Cheers