First time film - what is causing this greenish colors? Portra 400 at box speed/aperture priority, shot with kodak portra 400

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Jen | Canon F1 | Portra 400, shot on canon f-1 with kodak portra 400
Is this graininess my fault or the photolabs fault? Weird because alot of the shots are superr bad but then some came out clear. Got 4 rolls of film back from this lab, all 4 are super grainy. Would it be rude to ask for a rescan? [Olympus OM2n, OM-Zuiko 50mm f1.8, Portra 400], shot on olympus om-2n with kodak portra 400
Hocking Hills (AE-1, 50mm, Portrait 160), shot on canon ae-1 with kodak
Part 2 / Olympus35RC / Portra 400 and Santacolor 100, shot on olympus 35 rc with kodak portra 400
Ophelia II on 35mm, shot on canon a-1 with kodak portra 400
Portra 400 / Konica T3 / 50mm 1.4, shot on konica with kodak portra 400
Livorno [OM-2 spot program, 50mm, Gold 200], shot on olympus with kodak gold 200
A couple of portraits with the Yashica Mat 124G, shot on yashica mat-124g with kodak portra 800
Fuji✌️ | Contax TVS at ~40mm, shot on contax tvs with fujifilm
Green dreams (Minolta XD-11, Rokkor 35mm f/2.8, ektar100), shot on minolta xd11 with kodak ektar 100
Golden hour in Garachico. [Canon EOS 1V, 24-70mm f/2.8, Kodak Portra 400], shot on canon eos 1v with kodak portra 400
Italian summer, Canon AE 1, shot on canon ae-1