Have read some trunk threads....but not all.

On my new-to-me 95 E300D, I know the trunk opens, because I saw it open when I bought the car last month. But first time I tried to open it, nothing seemed to work. It wouldn't open via central locking system from driver's door. And it wouldn't open from trunk, even though key seemed to go distinctly into 1, 2, and 3 positions.

Then I unlocked the car from the PASSENGER side and the trunk opened.

What's going on?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife