TE stick skipping inputs

i have a round 2, and when i input quarter circle back motion, the input skips down-back. i didnt open the stick yet, but do you think i can fix this without replacing parts? i have a soldering iron if i need

Sorry, gotta start simple first, but you have checked the LS/DP/RS switch, right? If the switch is in LS mode, you get issues like that.

Try it again in DP.
Test this out ether in What ever fighting Games Training Mode with Inputs being displayed
Another game or App where you can take you time and see inputs in real time
Or your Game device properties app, where you can test the inputs on your PC (assuming your stick is PC compatible). A number of PS3 TE sticks have compatibility issues with Non-Intel/ Non-UCHI USB chip sets