I upgraded to 1.70 about 3 weeks ago.
I started a new game. I have been playing for about 2 weeks and only have a few kills under my belt.
I have loads of oxp's installed. Whilst at Diso I brought some food and textiles. I was going to sell them at Leesti but I thought I'd pop into the PI31 store near the witch point beacon first.
Good job I did because they were buying food and textiles at 100.8Cr per Tonne. I only brought the food for 3.6Cr and the textiles for 8.0Cr so I made a HUGE profit.
This was strange in itself, but I thought "Oh well" and headed off to Leesti with a new bank balance of just over 2500Cr.
At Leesti I upgraded my forward pulse laser to a forward beam laser. However in my F5 screen it shows that I have a beam laser AND a forward beam laser.
My bank account was debited for BOTH.
So I brought a forward pulse laser to get my money back for the beam laser I just brought and now the F5 screen shows me to have a beam laser, pulse laser and a forward pulse laser.
What's more, my back account has more than 429 Million Cr in it?
I also got debited twice for a starboard mining laser too.
I took out ALL oxps and restarted the game pressing shift whilst it loaded.
I reloaded my commander file again and did the exact same as above (buying a beam laser then replacing it with a pulse one again) but the bug is still there.
Here is a screenie.

Oh and before you ask...no I am not lending you any money lol.