There’s a bit of variance, it’s definitely no bug. I’ve seen people take issue with there being some variance but that’s personal preference and when it comes down to game design it’s typically seen as better to have variance because it allows for more potential interactions and replayability (things are not always pre-determined when you encounter the same matchup).
Megalo +0 = 36.6s
Canishogun +9 = 32.8s
Cani is easily faster! You can work this stuff out for yourself using a calculator and the formula I showed in this guide: KD's Bonus Potions and Entrance Speed guide - #6 by Killerdog