Turn signals acting weird

The number one reason a flasher does that is because there is a short somewhere in the circuit.
It could very well be a bad socket and that's where I would start. (by pulling all the bulbs and inspecting the sockets)
If both sides do it, then it's probably in the column or harness.

I would also pull all the bulbs and see if it still flashes on the dash without them, and if it does you for sure have a short.
Bulbs won't cause this by themselves.