I guess it's a strange phenomenon that only happens with the kit lens
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Pentax Spotmatic-F | MZ-5 | MZ7 | K100d Super | M28/3.5 | FA28/2.8 | FA35/2 | FA50/1.4 | FA77/1.8 | FAJ18-35 | FA28-70/4 | DA18-55 | DA50-200
S-M-C Takumar 20/4.5 | 55/1.8 | 105/2.8 | Helios 58/2 | Zenitar 16/2.8 FE | Cosina 100/3.5 Macro