Why is my iPhone X showing the charging symbol but gets stuck at 2%

Hi there, yesterday my iPhone X started acting out when I plugged it into charge. My phone was on 1% so I went to charge it and it worked fine, until I left it and came back to it having only got up to 2%. I have tried restarting it and cleaning out the port (however not professionally). So I left it on charge while I was asleep and woke up this morning to it being on 2%. I unplugged it and it went to 3% and then decreased normally until it got to 1%. I am using it now not plugged in and have been for about 15 minutes, is there any way it has charged but the number hasn’t gone up? Thanks!