It looks like my cucumber leaves are drying out but the cucumbers themselves seem pretty happy. In fact, I already picked 3 of them and they were delicious. Except the last one, which was a bit bitter. I'm attaching pictures of what they look like now. I don't know even know if this is a problem or just the life cycle of the plant. I would really appreciate any help on how to prevent this or any information that sheds some light into why this is happening. Thanks!