Server claimed game as a draw for no reason

I just played this game: lichess.org/ZCfVRgeg in the end I tried to practice my skills to check mate with N&B a little bit.

On move 84 the server claimed the game to be drawn for no reason.

Draw could be claimed in the following cases:

Time
Ok, I have to admit, I was extremely low on time, in the end... Only 11 seconds left on move 84. But still no reason to claim automatically a draw.

Stalemate
Nop, white's king got plenty of squares (c6, c7, e7)

Threefold-repetition
Black played the move Bd4 only twice in the whole game and even these two positions are different. Absolutely no way for this rule to apply.

50-move-rule
The last piece was taken on move 61 off the board. In my math that makes 61 + 50 = 111. So I had more than enough moves left for check mate.

Insufficient material
Nop. Knight + Bishop + King is NOT insufficient material.

So for what reason did the server claim a draw in this particular position?

Threefold repetition.

It doesn't matter how often the move Bd4 was played; what matters is how often the resulting position has been reached.

Oh darn, you're right. I guess this post can be deleted...

Moves 80,82,84.

Nah, no point in deleting 3fold post "bug" reports since lichess.org/learn still doesn't explain the 3fold rule.