Ken Kundert
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If you do not specify the rise and fall times of pulse sources, they are set to be 1% of the simulation interval. Perhaps that is what is causing the problem.
Alternatively, sometimes the instability in an unstable circuit is not excited unless you use sufficiently small timesteps. This is discussed in Section 4.4.3 in my Spice and Spectre book.
If you want more specific comments, you will have to describe what you mean by "odd".
-Ken
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