Pattern Length Is Longer Than Intended

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Just trying to make a simple 1 measure long snare roll with the Start point automated.

Pattern length seems to have increased to multiple measures. How do I bring it back to 1 measure?
You can either get rid of a note that is after the last 16th of the measure or create different blocks of the BBeditor pattern instead of a long block.

In a snare roll, you may want to use 32th notes: if you put one at the last possible place, it will virtually exceed the measure (because of how pattern notes are made: they are not as long as shown in piano-roll)