Support notification keeps flashing after closing down answered issue

ISP: Telefónica de España

Type of Internet Connection: DSL

Internet Connection Speed: 10Mbit/s

Date & Time: 21/01/2015, Time not recorded

Frequency: Always

Character Name: Umo Heima

Race: Lalafell M

World: Ragnarok

Class/Level: Black Mage/50

Area and Coordinates: Time at which I received the response not recorded. Currently it just happens everywhere.

Party or Solo: Solo

NPC Name: Not recorded.

Monster Name: Not recorded.

In-Game Time: In-Game time at which I received the response not recorded. Currently it just happens at any In-Game time.

Steps:
- Sent a report using the in-game feature to do so.
- Short after I received a response (21/01/2015 4558932 Regarding Your Inquiry)
- I opened it through Support and Information menu (Information > Recent Replies & Notices), read it and then I hit the Close button.
- I accepted the pop-up window asking me to Close the issue or Cancel current selection (so I hit "Close issue).
- I accepted next window by clicking on "Yes" button.
- Support notification displayed on UI keeps flashing and refuses to disappear, even if I log off and log back in.

NOTE: I've closed every single notification on Recent Replies & Notices and on History tab, but to no avail. I've closed several issues before patch 2.5 with no problem at all.