When I correctly rememver Your other posts, You've got the Razor from Lynn - so it should have been honed properly and sharp. Otherwise I would have said that DOVO's are not very sharp coming from the factory.
With a little nick in it, the razor will have to be honed and a finisher-stone allone won't do that (without a doing hundret million strokes). The Edge truely is sensitive. When You hit - I mean touch - anything hard it will be at least bent. Your fingernail is engough. I think You would normally not get a nick from the strop, but hitting the leather's edge permenticular might be enough (did not try). Hitting any metal definitely will.
In my almost endless "hello"-post I had the idea of putting a piece of tape around the edge in order to protect edge, strop, and take some of the "excitement" out of the matter. As Your blade is dull now (probably still sharper than anything else in Your household), You might try that.
Then take it slow - slow motion is fine for the first strokes and the only way You can actually see what happens.
When You start stropping or on the upper or lower turnpoints do *not* lower the edge down to the leather untlil You're not already moving towards You (or away from You respectively). If You fully lower the blade at the turning point, chances are high that You move just a fraction of an inch into the (now) wrong direction and cut the leather.
When I restarted after 15 years I also caught a few light cuts at the turning points, because I once used to be a cool guy who could do it and simply started too fast. I was back on track after one or two hundret strokes, but had cought some very light cuts.
I used fine sandpaper to smoothen them, nailfail would do as well.
HTH