DBelton is correct, and I'll add one more point: There's an ugly and dangerous hack called a hybrid MBR
that involves a sort of dual-partition-table setup, with both GPT and MBR components. Hybrid MBRs are popular on Macs and among the Hackintosh community, but if they're manipulated inappropriately, they can produce symptoms that are similar to what you describe. In the past, some Linux distributions set up hybrid MBRs whenever they created GPT disks. OpenSUSE did this for a while, but they've stopped doing so in the last few months.
Anyhow, it's conceivable that one of the partitioning tools you used set up a hybrid MBR and another got confused by this and ended up wiping out some or all of your partitions as a result. You'd need to carefully monitor your partition table at each step of the way to be sure that this was (or was not) happening.