Leftover grains from previous recipes. Too much diastatic power of the grain, possibly caused by excessive base malts and the use of wheat malt (commonly uses as the main base malt in wheat beers) leads to increased OG and ABV (drier finish). Maybe compensate with higher mash temps (less fermentable wort), though not advisable.

Closest style maybe Altbier, both in color and IBU. Altbiers usually discard late hop additions for aroma, but a german noble hope like Saaz fits wel is not uncommon, if in low quantitiesl. On brew day, maybe an additional 0.5 oz on the bittering hops. BJCP style guidelines place bitterness from 35 to 50 IBU.

Common for Altbiers to adopt 75-90 min boils. Mash usually at lower end temps (64.4-65.5) for "more fermentable sugars and that crisper mouthfeel". Consider mashing at slightly higher temps for smaller attenuation and higher FG, although BJCP advises to "mash low at 144º - 148º F for a higher degree of fermentabilty and greater attenuation if doing a single-infusion mash"