strange symptom on phal leaves

[prisana]

Hi, Does anybody know what causes the leaves of Phalenopsis to have crooked brown lines across them? These are indented, somewhat flaky, they kind of look like scratch marks. The leaves become distorted and bent unaturally. Two of my Phals are affected , but not all the leaves are affected, they only occur on new leaves. I grow all my orchids outside all year until Florida winter hits. Are the marks from bugs or disease ? I've never seen any bugs on them, but then I don't own a magnifying glass. Thanks in advance