I've been carb cycling (6 days keto, 1 day high carb) for the past 10 weeks, and without fail I always get gassy the day after my high carb days. Carb metabolism is supposedly the main source of gas production in your intestines, so makes sense to be gassy after eating junk food that's mostly carbs.
The gas was normal for me when I was doing keto with carb load weekend days. I wouldn't call that carb cycling though. That sounds like CKD Keto.
Carb cycling is more like
Mon: 300g carbs
Tues: 200g
Wed: 100g
Thurs: 300g
Fri: 100g
Sat: 50g
Sun: 0g