Gels and heart rate

Hey running community! Ran a half marathon today and noticed that every time I would take a gel (no caffeine) my heart rate and perceived effort would go up for about 5-7 minutes, sort of derailing my focus and pace. I’m not entirely sure that this is due to the gel itself as much as it feels like it takes effort to open and consume it with water without slowing down. Maybe I’m just not coordinated enough. During my training I would slow down quite a lot so didn’t bother me as much. I use a hydration vest to minimize disruption and still.. here we are. Anyone had similar experience or tips on how to fuel and run?