"Step" at right edge

[GGDRriedel]

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In all of my classifications I hav thishorizontal line on the right edge:

I am putting in slightly bigger images than the network expects since I am working with scientific data, not with "images"

I have tested this on different types of data.

Usug code like this:

model2=resnet50_pspnet(n_classes=6,input_height=576, input_width=576)
model2.train(
    train_images =  "data_gpr/",
    train_annotations = "labels_gpr/",
    epochs=5,
    gen_use_multiprocessing=False,
    ignore_zero_class=False,
    optimizer_name='adadelta',
    do_augment=False,
    augmentation_name='aug_geometric',
    verify_dataset=False
)

Inpput images are actually 417 * 500 px

Is this due to some error in my scaling? I am kind of out of options here and would be very glad for some help.