My charity donate last year was around $100-150 why is the standard deduction so big

Im very confused it only gives the option $1-$3,100  and after I finished the deduction part it said i get like 13,000 back and that seems very wrong i only donated to those donations at store for like 10-20$ a couple times but i know its at least $100 the only other thing it can be is the medical expenses was $0 cause i never had any medical problems last year