You're next to the general store NPC and bank NPC, you can easily go to the general store NPC, buy something, go next to the bank guy quickly, and make a screenshot, though you'd be very fast in order to do that, it's possible.

And you could've put the rest of your money in the bank, or give it to a friend or so.

Or it could've been a glitch/bug.

It would all be possible, and it would be kind of impossible for us to see if you got bugged/glitched or did it on purpose.

You're next to the general store NPC and bank NPC, you can easily go to the general store NPC, buy something, go next to the bank guy quickly, and make a screenshot, though you'd be very fast in order to do that, it's possible. And you could've put the rest of your money in the bank, or give it to a friend or so. Or it could've been a glitch/bug. It would all be possible, and it would be kind of impossible for us to see if you got bugged/glitched or did it on purpose.