I received some gifts (wisp, glimmer dust, etc) from my neighbors in the past weeks. And I immediately gifted them back. But next day the "gift back" reminder popped out again in my news board, saying "xxx has sent you a gift. Please gift them back" something like that. Originally I thought it's because I wasn't allowed to receive gifts like wisps and glimmer dusts. So I sent whatever they sent to me back to them. But the "gift back" news still showed up next day. For some gifts, I already sent gifts back three times but it didn't help. I have checked the date I got those gifts and it was 2 days ago, 7 days, 14 days, etc. So I am pretty sure they are not reminder notes for new gifts. Now I have ~10 "gift back" news in my news board. Does anyone have this problem?

Also I noticed when I sent a gift back to my neighbor, I didn't see a drop of the amount of that item in my inventory. Does this mean my gift was not sent or was not accepted? Anyway, it's really annoying the system reminds me to send gifts back everyday even I have done it.