I think this is the result of discrepancies in the buff order between the client and server.
When I started on P99, If you refreshed a buff that you already had, it wouldn't change the location in the buff stack even if slots above that location were free. At some point, this changed so that refreshing a buff would move it to the first free slot in the stack.
My guess is that the client was changed but the server retains the old behavior, which results in the discrepancy.
Many of the buff reordering issues I've seen seem to result from this, but not all of them. I've also seen strange behavior result from being given a buff that is somehow blocked, such as a str buff blocked by rez effects or a str debuff, or similar issues with regen etc. The buff isn't there as far as the client is concerned, but logging or zoning perhaps causes the server to assert that it's there.
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