Should I be worried?

[b2tf]

Went to use the flash tuner on the ute today to put it back to stock, as Im a bit tired of the tune I have on there at the moment.

It reversed no worries and I loaded the stock program, but I found that after doing that and driving it, it is changing gears really erratically, revving right out and getting some major driveline clunk happening. I know its normal for it to be a bit wobbly afterwards as it's learning the driving style and conditions etc, but this felt as though something was actually wrong, it's never behaved that way before.

As a precaution I have actually put the custom tune back in, and it's driving ok now. Just wondering what I should do though?