I'm am also 1 of the affected reduced post count in my account. And i think its not a problem since a new post are not deleted and only the oldest post are got deleted i think you can inform the signature campaign manager to check your present post instead of the old post.
I notice my post count was reduce and i think its not a big deal anytime you can contact the manager who manager your campaign.. Since the signature campaign of coinroll is automated bot counts it can really affected your post count the same happen to someone join in bitmixer campaign that i think better to contact the manager of your campaign.
And i think mods/admin are always doing the right thing for everyone not only to you or me..