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I figure you are referring to some recent posts/threads of yours that have been deleted. Going over the
ModLog I’ve found a couple:
Remove topic: Argentas will it be a next bitcoin .... in topic #5152955 by member #969398
Remove topic: Grab this two opportunites before it is too late... in topic #5152235 by member #969398
Both posts were deleted because the threads where they were posted were entirely deleted themselves.
I’m not sure if your posts were OPs (threads openers). In anycase, someone reported them for being of low quality, full of spam or alike, leading to the threads being deleted. The process is not automatic, but the threads may have been reported rather quickly and acted upon in a short period of time.