Swiftkey won't stay by default when rebooting

[soulboogaloo]

Hi y'all,

newbie in this forum here, and quite new to the MIUI world as well!
I have a question : I'm using Swiftkey for months now, but now that I'm on MIUI, I noticed that each time I reboot my smartphone, Swiftkey isn't the default keyboard anymore, I have to select it again.
I tried to put the Swiftkey app into the autostart app, but it doesn't seem to work...
Any clue on that issue?

Thanks a lot!