Fast Charging issue

I was using a charger at work that I used to use to charge my S10+, and others have used it as well. I turned fast charging on my S21 Ultra on and hooked the charger up. After 1 hour, it had only gone from 42% to 57%. The phone said it was fast charging and should have taken a little over an hour to fully charge it from the original 42%. Anyone else had this issue?

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