Or are you skipping a warm-up altogether?
The second you step foot in the gym, a clock starts. No, I don’t mean the clock on the wall telling you how many minutes of burpees you have left. I mean your training clock.
There’s only so much your body can tolerate/energy you can give in a single session. Everything you do including your warm-up, training session and cooldown count towards your training clock.
Even the time you spend talking counts. Or laying on a foam roller (but not actually foam rolling). You know who you are.