Missing messages in 1:1 chat

Hi,
in a 1:1 chat I miss messages since yesterday.
I got a message but all messages before are gone.
I didn’t do anything in the settings. Affected is only one chat. The messages in other chats are all there.
My chat partner created a second device with my account on a desktop delta chat but it didn’t show either.
Does someone can help or has an idea how to fix this?

Hi rebekka, maybe your partner did not follow these instructions https://delta.chat/en/help#multiclient. If your partner did not follow these instructions he should delete deltachat on the second device and install it again following these instructions. Otherwise the reason might be that you have now a second chat on your device.