ripped by the exchange

Saw the BTC price dropping.
At 90.200 dollar I was like lets buy.
Somehow the exchange sold me 93.175 eur.
The 1 min candle I bought;
opened @ 91.197 eur
H: 91.903 eur
L: 91.001 eur
closed @ 91.500 eur

The line chart was completely off.

Somebody explain this to me!
I closed my account at Bitvavo now!