When was the last time you saw them living? The bloating can be from decomp (gasses and nasty processes as such) and in higher tempts (basically above room temp) that process will be brought on faster and more aggressively.
So you just got another snake, and it appears you didn't quarantine What happened is this snake came with a problem, and others caught it. Have necropsies done and find out what killed them. But I bet you it originated in the new additon
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