I just checked my 3 year old Inspiron 15 5577 model and no keyboard marks.
If this is a real recent purchase, timeframes vary depending on what country you are in, a return/replacement is possible.
If its past the return period, talk to Dell support to see if you can get a resolution.

I am not a Dell Employee
Dell forum member since 2002
Dell Inspiron 15 Gaming 5577 Laptop
Home Built Desktop PC with Gigabyte Designare Z390, i9 9900K CPU
Windows 11 64 bit Pro SSD drives. Cakewalk by BandLab and Studio One 4.6 Pro Recording Studio Software, MOTU Ultralite MK5 recording interface unit
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Dell S2719DGF Monitor