Diff preview showing a removed character, where one was not removed

Diff:

diff --git a/src/main/kotlin/com/project/version/controller/CheckController.kt b/src/main/kotlin/com/project/version/controller/CheckController.kt
index 726e8f6..972a4ca 100644
--- a/src/main/kotlin/com/project/version/controller/CheckController.kt
+++ b/src/main/kotlin/com/project/version/controller/CheckController.kt
@@ -14,7 +14,7 @@ import reactor.core.publisher.Mono
 @RequestMapping("/version")
 class CheckController @Autowired constructor(private val checkService: CheckService) {

-    @GetMapping("/check")
+    @GetMapping("/check", "/version/check/v1")
     fun checkAppVersion() : Mono<ResponseEntity<CheckResponse>> {
         return checkService.checkAppVersion()
     }
(END)

Rendered diff:

From the screenshot, you can see the < character is highlighted in red, which to me is a visual indicator it has been removed. However, from the raw diff you can see that it was not removed. This is also confirmed by using the editor UI in Gitlab and viewing the file

version: GitLab Community Edition 11.11.3