Falsche Dateinamen beim Download

Hallo,
ich habe auf meiner Drupal-Site das Problem, dass von Usern hochgeladene Dateien beim Download immer falsche Dateinamen wie z.B. "Download.pdf" (bei PDF-Dateien) oder einfach nur "Download" (bei 7z-Dateien) haben. Als Standard-Downloadmethode habe ich Privat. Woran kann das liegen?
(Ich habe diese frage auch auf drupal.org auf Englisch gestellt: https://drupal.org/node/2109847)

Andere Beispiele:

"File Name Like This 42.pdf" --> "Download.pdf"
"File-Name Like That 43.7z" --> "Download"
"Filename.zip" --> "Download.zip"
"File NAME (Like This).mp3" --> "Download.mp3"
"Filename_44.exe" --> "Download"
"file-name-45-like-this46.jpg" --> "Download.jpg"

Meine Datei-Feld-Einstellungen:

- Title = Datei (=file)
- Duty = Unchecked
- Help text = Please don't upload......
- Allowed extensions: 001, 002, 003, 004, 005, 006, 007, 008, 009, 7z, 8be, 8bf, 8bi, abr, adf, ai, air, apk, arc, art, asd, aspx, avi, bak, bat, big, bin, bmp, cab, cap, cbr, ccf, cfg, conf, cpt, cr2, crw, crx, cso, cue, daa, dat, db, dbk, dcm, dib, diz, djvu, dlc, dll, dmg, do, doc, docx, dot, dotm, dotx, dwg, dxf, epub, eps, exe, fax, fdb, flv, gho, gif, gpx, htm, html, ico, ics, idx, ima, img, indd, ini, ink, ipa, ipd, iso, jar, jpg, key, lic, lit, lst, lua, map, mdb, mdi, mht, mid, mix, mkv, mobi, mod, mov, mp3, mp4, mpg, msf, msg, mts, mus, nbu, nds, net, nfo, nk2, odp, ods, odt, ogg, one, orf, pages, pak, par, part, pcv, pdb, pdf, plt, pps, ppsx, ppt, pptx, prc, ps, psd, psf, psp, pst, pub, qtz, r00, r01, r02, r03, r04, r05, r06, r07, r08, r09, rar, raw, rpt, rsdf, rtf, sav, saver, scr, sfv, shs, sid, sis, sit, snp, sol, srt, step, sub, swf, tib, tif, torrent, trp, txt, ufo, vhd, vob, warn, wav, wdb, wim, wmv, wpd, wps, xlr, xls, xlsx, xml, xpi, xps, zip
- file directory = Empty
- Max. file size = Empty
- Description field enabled = Unchecked
- Max. values = Unlimited
- Show field option = Unchecked
- Show files by default = Unchecked
- Upload destination = private files

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