25.4 clamp stem with 26 bars?

is this ok? my dual came that way . now I’ve got a profile stem on there, after having had a ritchey for a while - it’s obviously a smaller clamp on the profile.

any safety issues do you think?

Yeah, you crack the bars from over pressure or the stem from the angled bolts. If you’re lucky it will happen when you are not going too fast and not near a passing car. It’s penny wise on the price of parts and pound foolish on your health and the health of those behind you to use the wrong size stem with a handlebar.