It is normal for most monitors to not display the Lisa video correctly, as the signal does not have standard timing.

I recall someone saying they found a monitor that did display the image OK (although adjustments to horizontal/vertical size were necessary), but most reports are that external monitors won't/can't synchronize to the Lisa's unusual signal.

I'm trying to use my Apple IIe monitor as a secondary monitor for
the Lisa. However, when I connect the monitor to the computer
through the video out port, the external monitor looks as if I need
to adjust the horizontal hold (i.e. the images are very blurry and
distorted, and they are duplicated from left to right). Is my video
out port bad, or am I simply using the wrong kind of monitor?

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