Fix: debug PDF positions.. (#10365)

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/flow/splitter/splitter.py

@@ -100,7 +100,7 @@ class Splitter(ProcessBase):
             {
                 "text": RAGFlowPdfParser.remove_tag(c),
                 "image": img,
-                "positions": [[pos[0][-1], *pos[1:]] for pos in RAGFlowPdfParser.extract_positions(c)],
+                "positions": [[pos[0][-1]+1, *pos[1:]] for pos in RAGFlowPdfParser.extract_positions(c)],
             }
             for c, img in zip(chunks, images) if c.strip()
         ]