Hi Rick,
Presuming you are doing everything correctly but still getting these funky results i have a possible explanation for you.
I've no problems with that shot myself, In fact my fav' shot from 18 yd's - 53 yd's BUT previously i had some funky results when doing everything correctly & it happened on a previous Browser.
Like you the shot would back up/Spin back yard's, I'd double check before i hit to make sure i'd the 50 punch selected & it would still back up (From FW) & how i solved it with that old browser was to take a "ghost" swing, Let the meter run through but don't click as the caddy will probably initially give you the 60 yd Full Wedge 1st & then you switch to the punch but even though it shows the 50 punch in your hands it was like it didn't register until i took a "ghost" swing & then i'd get the hop n stop.
The above only happened with one particular old Browser, I no longer have that problem so don't need to do the "ghost" swing anymore, Try it if you like your Browser & want to stick with it for meter smoothness or try switching to a different Browser
Ken