While there is no way to definitively comment without having seen the play, as described (and the picture I have in my mind from that description), I would be inclined to agree with mcrowder's assessment that this is "nothing", play on.
A bases loaded force at home on a grounder to the 2nd basemen is typically a "close play". The left-hand batter's box begins six inches from home plate. It is well within the realm of likelihood that the R3 made a perfectly legal slide into home and "upended" the catcher with his butt resting on home plate.
It's also entirely possible that the R3 went out of his way to (intentionally) interfere with the F2's chance to complete a double play on the BR. Can't tell from the description.
JM
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