Your setup seems normal (will need a roof by week 3, they will fly right out trust me lol), looks like you bought then TSC starter box, and are using the same feeder/water/heatlamp I use. Looks like your using the TSC, premium pine shavings (yellow bag) same I am using.
Which water are you giving them? City, well, bottled?
To start I would, dump the bedding, bag and all, and get a new bag, might be the bedding was left outside in the rain or something and is bad.
Sterilize every inch feeders included, and start with fresh new bag of bedding.
Check the feed, make sure it is chick starter, not anything else. If getting it from TSC, should say Dumor chick starter 24%. Might be a bad bag of feed, look close. I will warn you the sniff test of the Dumor bag, it smells awful, I even questioned this when I opened mine, it smells bad but it’s the way it is.
Do you have a local feed and seed, or farm store? It’s possible the TSC has issues and your just getting sick chicks, maybe go to a local non big box store and order checks through them.