Benzelsanswered grow question 3 years ago Thats not from topping my friend. You had an issue well before you topped her-and you didnt know it until now. Chill-it happens.
Now the usual list...
0. Yes 0-make sure you light isnt too close to the plant! Most obvious and most overlooked issue. If you moved it closer down or the plant up then move the light higher up/ or if you turned % of light up-turn it back down a touch. But thats not your issue here.
1. Check Ph of soil/run off. Im pretty sure that should be fine or only slightly off, not really enough to make a diff unless you accidentally screwed up the last feeding and added WAY too much Ph up or down...That does happen too and a water flush fixes it.
2. Dont feed it anything for a 3-4 days to a week. It will be fine for up to 10 days nute free with just water. It will.
3. After you check run off for Ph, if thats fine then check it for PPM if your still coming up with no answer for why plant looks burnt. If your PPM is way high thats your answer.
Im lazy on doing most of that so personally- id not water it for a few days (2-4) and then give it a light plain water flush-dont go silly 1-2 times vol of pot is enough by far!! And then let it almost dry out again and then use half strength nutes for a week before re-assessing the plant. Thats if you dont want to follow the list and actually figure out the prob.
You could also just switch to 1/3 to 1/2 strength nutes for 2 weeks and see how the plant responds over this time...it will tell you if its liking it or not after the first week. Honestly I usually do this to fix most of my over feeding issues as flushing is a pain in soil, and while it will fix the issue if you have overly high PPM, it also causes other issue like over watering and it can be messy, so unless your run off is 1000PPM or higher (and if it is that high in veg what are you doing??) well id avoid the flush and just run light nutes for a few weeks.
Last possible cause is some mineral nutes dont have trace elements and minerals in their base mix or not much-thats in an "add on bottle" you have to buy as well and if you just run the base nutes without the trace mix/or a cal mag sup you can have issues but not normally this soon in veg if thats the issue.
Hope that helps mate.