Many of us have had our posts deleted at one time or another, some without proper understanding or explanation and others with. If it is off-topic then the post probably should not have been made.
Keeping in mind making back to back posts will result in a moderator merging them sometimes along with a message about consecutive posts, that is problematic in my opinion however for you to state moderator changed the text, I cannot recall reading about that before. Post a link with the modified post along with the original unedited text too in order to verify what actually happened.
I've had many posts deleted. Once I reposted a deleted post and the moderator changed the text. Now with this username there have been no outright deletions, but a moderator combines any two posts into one then sends the message
The past post where a moderator changed text I do not have a link to, if I remember what thread I'll link.
In this thread the moderator changed the tenor of my response by merging two separate responses to two different people then added a horizontal line to change the style of my original post.
There was no reason for the moderator to make those changes except to 'prove' his authority i.e., the authority of a poodle that nips your ankles.