You cannot buy or sell resources with hotkeys for 100 units, only 500.
Thank you for the report, this bug is now being tracked.
Nice that it was noticed fairly early. This can be potential game breaking for players that rely on market hotkeys and dont notice what is happening.
Any news on this bug? 2 months later and buying/selling via hotkeys still does 500 instead of 100. Clicking seems to just buy/sell 100 still though so at least there’s a work around
Do not worry, it is still tracked!