I bought some tanks on the public market and got the message:
"Some of these goods were purchased for a better price on your private market."

When I then looked at the internal market, the number of available tanks to buy was "-225,665"

I then tried to buy one tank from there and got:

"You purchased nothing. Please ensure you entered a valid amount of goods to purchase", which seems reasonable and it then showed the quantity available as 0.

that was a problem with the market change I made last night.

It should be fixed now
Let me know if your PM doesn't fix itself

It looks like it is back to not looking at the internal market when you buy on the public, even if you have cheaper goods on the internal market.

The bug is no longer there, but is the functionality as intended?

If I have 1,000 tanks in the internal market and buy 999 on the public, it will now buy all of them on the internal market if it is cheaper. If I instead buy 1,001, it will buy all of them from the public market?

From what I remember, in Earth:2025 it would have bought 1,000 on the internal market (if it is the lowest price) and the remaining 1 on the public market.

yea, i tested that in FFA with 500k tanks on a theo and got the same fail.
[edit
What i was trying to do was see if you bought more from your PM then it had in stock,and just put PM in negative numbers of stock...

moronic1 is correct, we'll have to fix that i think

So you not only get the higher price but it fluffs your PM...ouch, gotta make sure not to do that!

mmm it shouldn't "fluff your PM"

it should just not buy from the PM if your PM doesn't have enough space to fill the whole order

it was not my intention to make the PM do partial sales, but if there's a need for that we can certainly add it :)