Triple differential dijet cross-sections in ep interactions measured with the H1 detector at HERA are presented in the region of photon virtuality 2 < Q^2 < 80 GeV^2, inelasticity 0.1 5 GeV, E_t_mean > 6 GeV and pseudorapidity -2.5 < eta^* < 0. The data are compared to Monte Carlo simulations which differ in their assumptions about photon structure and employ DGLAP or CCFM parton evolution scheme. Indications of effects connected with the resolved processes of longitudinally polarized virtual photons are investigated for the first time.