Interference Question

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Thought this sit had been discuused last year but can't find it.....

ASA Rules, select ball not rec league.

R1 on 3B and R2 on 2b, less than 2 outs. Batter hits a shot to right field. R1 crosses home plate and R2 rounds 3B and goes home. F4 throws ball to F2 who tries to tag R2 as she gets to the plate. However, R1 decided she missed the plate and returned to step on the plate just as F2 is trying to tag R2. R1 clearly interfered with the play.

I was on bases and my partner had a brain freeze at the plate so I ruled interference and R2 out since I thought R1 had scored.

Questions- how could R1 return to try to touch the plate and not interfere? Next, had R1 not returned to touch home plate, could the defense still appeal a missed base on R1 after R2 scored? After the dust settled on this one and all the yelling died down I began to doubt my sanity about it all.