If you would post your addon list, it would be easier

If it's srendar you can check this by going to the Srendard settings, check the "Action bars" and enable the "Movbing of them".
You'll see on screen the movable bars which you are able to drag&drop to other positions. There should be one bar at the position where you get these buffs then.

But the icons look the same like Srendar icons for me so Ig uess it is Srendarr too.

If you want to be really sure install the addon "Zgoo".
Then reloadui.
Define a keybind in the controls for "Zgoo - under mouse" and as the icons show up enable the mouse cursor, move the mouse cursor above it and press this keybind.
Or if you do not want to use a keybind just move the mouse above the icon and write to the chat:
/zgoo mouse
Then hit the return key.

The zgoo window will show some ionformation about the control below the mouse cursor.
If you scroll down a bit in this zgoo window you'll find something like "GetName()" = "ControlName1" where ControlName1 is any name which an addon or the base game UI defines.
If it's an addon it most likely starts with the Addon name. if it's from the game it most of the time starts with ZO_ (Not every time).
So if the icons control name is ScrendarBuffBar3Icon2 you know it's e.g. Srendarr.